Creepy scream catching boring thing (6)
I believe the answer is:
crawly
'creepy' is the definition.
(crawling or creeping along)
'scream catching boring thing' is the wordplay.
'scream' becomes 'cry' (synonyms).
'catching' indicates putting letters inside.
'boring thing' becomes 'awl' (tool for boring holes).
'cry' placed around 'awl' is 'CRAWLY'.
(Other definitions for crawly that I've seen before include "Creepy- --" , "moving slowly" .)